IL17A and breast cancer: Wu et al. detected high proportions of IL-17-producing cells among γδ TILs in colorectal cancer,84 whereas Meraviglia et al. reported only low numbers in a different cohort of colorectal cancer patients.68 Very few IL-17-expressing γδ T cells among breast-cancer-infiltrating γδ TILs were reported in a recent study by Janssen et al.87 Again, we expect that better conclusions can be drawn in future studies using automated high-content imaging of tumor tissue to more precisely define and quantify immune cell composition within the tumor and peritumoral tissue.